Magnetic Circuits and Transformers
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Questions and Answers

What is the unit of magnetic flux?

  • Henry
  • Ampere
  • Tesla
  • Weber (correct)

What is the direction of magnetic field determined by?

  • Fleming's Rule
  • Left Hand Rule
  • Curl Rule
  • Right Hand Rule (correct)

What is the magnetic field intensity (H) proportional to?

  • Length of the magnetic path
  • Number of turns and current (correct)
  • Magnetomotive force
  • Area of the magnetic field

What is the line integral of the magnetic field intensity (H) around a closed path equal to?

<p>Current enclosed (A)</p> Signup and view all the answers

What is the relation between mmf and magnetic field intensity (H)?

<p>mmf = N i / l (D)</p> Signup and view all the answers

What is the relation between the magnetic field intensity H and the magnetic flux density B?

<p>B = μH (A)</p> Signup and view all the answers

What is the unit of magnetic flux density?

<p>Tesla (B)</p> Signup and view all the answers

What is the purpose of the magneto-motive force F?

<p>To set up the magnetic flux lines within the magnetic material (D)</p> Signup and view all the answers

What is the relation between the reluctance ℜ and the permeability μ?

<p>ℜ = l/μA (D)</p> Signup and view all the answers

What is the effect of saturation on the magnetic material?

<p>The change of B is non-linear at higher values of H (C)</p> Signup and view all the answers

What is the purpose of the magnetization curve?

<p>To show the relation between the magnetic field intensity and the flux density (D)</p> Signup and view all the answers

What are the two kinds of power losses that occur in a magnetic material during cyclic magnetization?

<p>Hysteresis loss and eddy current loss (A)</p> Signup and view all the answers

What is the unit of the magneto-motive force F?

<p>Ampere-turn (D)</p> Signup and view all the answers

What is the relation between the magnetic flux Φ and the magnetic flux density B?

<p>Φ = BA (C)</p> Signup and view all the answers

What is the purpose of the reluctance ℜ in a magnetic circuit?

<p>To oppose the magnetic flux (A)</p> Signup and view all the answers

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